Question # 1

A radiation spectrum which is continuously distributed over a frequency region without being broken up into lines or bands is known as.

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Continuous spectrum

Band spectrum

discrete spectra

Absorption spectrum

In Compton's effect it was considered that X-rays consist of

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Electrons

Holes

Neutrons

Protons

Marie Curie and Pierre Curie discovered two new radioactive elements which are.

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Uranium and radkum

Platinum and radium

Polonium and radium

Crypton and radon

In annitilation of matter, positron and electron pair disappears into two

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Alpha particles

Beta particles

Game particles

X-rays

A girl standing 150 m in front of tall building fires a pistol A boy standing 350 m behind her hears two bangs 1 s apart from this information what is the speed of sound in air.

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150 m s-1

300 m s-1

280 m s-1

330 m s-1

Diffusion of gases occurs because the molecules of the

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Gas present in a higher concentration exerts a high pressure

Gases are different

Gasses attract each other

Gasses over about randomly

Which one of the following temperature scales is independent of the properties of any particular substance.

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Kelvin scale

Gas scale

Thermodynamic scale

Celsius scale

In radiotherapy X-rays are used to.

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Treat cancer

Delect bone fracture

Cure heart diseasee

All of the above

The energy delivered to the tissue per unit mass is called the absorbed dose of.

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X rays

gama rays

Radiation

energy

The locus of all points in a medium having the same phase of vibration is called.

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Creast

trough

Wavelength

Wave front

In a photocell, certain metals emit electrons for

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Visible light

X-rays

Infrared light

Ultraviolet light

At room temperature the potential difference between the two sides of depletion region for silicon is of the order of.

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0.3 v

0.5 V

0.7 V

0.9 V

when a bowl of water is take into the bottom of a well the work done is.

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Positive

Negative

Zero

Maximum

Which of the following cannot be polarized.

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Ultraviolet rays

Radio waves

T.V waves

Sound waves

A pulse on the string is inverted when it is reflected from

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Free end

Fixed end

Either of the two

Rubber cord

Which of the following is an example of induced magnetism.

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A compass needle pointing north

A north pole attracting iron filings

A northpole repelling a north pole

The coil of a motor turning in a magnetic field.

If a body retains completely its altered shape and size, it is said to be

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Perfecto elasticity

Perfect plasticity

Elasticity

elastic limit

The ratio of intensities of two sound waves is 4 : 9 what will be the ratio of their amplitudes.

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9:4

2:3

3:2

4:9

The air pressure at the bottom of an air foiling motion is

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Greater than that on the top

Equal to that on the top

Grather than that on the top

Zero

Which of the following is not an application of diodes.

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A filters

Bridge rectifier

Half wave rectifier

Full wave rectifier

Which term best describes the nature of light from modern view point.

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Waves

Rays

Particles

Photons

Which of the following quantities is not changed during refraction of light.

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Its direction

Its speed

Its frequency

Its wavelength

Why does a transformer have a core made of iron.

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Iron has a high melting point

Iron is a magnetic material

Iron potential and high current

Iron is a conductor of electricity

An A.C. dynamo operates on the principle of

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Mutual induction

Self induction

Electromagnetic induction

Mechanical induction

Which one of the following is not a dimensionless quantity.

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Radian

pi

Decibel

Force

What is the power rating of a lamp connected to a 12 V source when it carries 2.5 A.

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4.8 W

14.5 W

30 W

60 W

The graph between restoring force and time in SHM is a

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Straight line

Parabola

Sine wave

Circle

A substance which has empty conduction band.

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Insulator

Conductor

Semi conductor

super conductor

Which of the following type of force can do no work on the particle on which it operates.

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Gravitational force

Frictional force

Centripetal force

Elastic force

A sonometer or audiometer is a device based on the principle of.

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Resonance

Beats

Overtones

Harmonics

Besides U ²³⁵ what else is needed for making as atomic bomb.

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Electons

Protons

Neutrons

Photons

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